Perhaps you should try some spelling variations:
"modified quantile approximation algorithms" » "modified time approximation algorithms", "modified diophantine approximation algorithms", "modified adaptive approximation algorithms"
"modified notion estimation algorithms" » "modified notion estimation algorithm", "modified notion optimization algorithms", "modified notion optimisation algorithm", "modified motion estimation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified notion estimation algorithms") OR ("modified quantile approximation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion estimation algorithms\") OR (\"modified quantile approximation algorithms\"))*".
• Removing quotes may allow a broader search: (( modified notion estimation algorithms ) OR ( modified quantile approximation algorithms ))*.